Typewriting machine



Oct. 13, 1925. 1,557,076

c. T. MILLER, JR

TYPEWRITING MACHINE Original Filed Jan. 31, 1920 Patented Oct. 13, 1925.

UNITED STATES PATENT OFFICE.

CHARLES T. MILLER, m, 0]? BROOKLYN, NEW YORK, ASSIGNOR T0 UNDERWOO 'D.TYPE- WIjITER COMIPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITING MACHINE.

Original application filed January 31, 1920, Serial No. 355,449I Divided and this application filed November 9, 1922;

herein disclosed in connection with a decimal tabulating device which is adapted tobe actuated by the numeral-keys of the typewriting machine, and is especially adapted to be incorporated in machines of the usual type, such as the Underwood machine, with the minimum amount of modification or special work. This is a division of my application No. 355,449, filed J anuary 31, 1920, now Patent No. 1,441,237, granted January 9, 1923.

I Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a fragmentary sectional side view of an Underwood standard typewrit ing machine, showing the present invention as applied thereto, the parts being in normal condition for typewriting.

Figure 2 is a plan view of a numeral-key,

showing the, numeral legend I displayed by' the rotatable top, and showing the concealed ,tabulating legends through the top. i

Figure 3 is a sectional side view of the key seen in Figure 2.

Figure 4 is a plan view of the bank of,

numeral-keys, showing the concealed tabu lating legends on the keys.

Figure 5 is a view on a smaller scale, simi lar to Figure 2, but showing the key-top rotated to display one tabulating legend and conceal the numeral.

In the Underwood standard typewriting machine, alphabet-keys 10 and numeralkeys 11, when depressed, carry down keylevers 12, rocking sub-levers 13 to carry type-bars 14 upwardly and rearwardly, so that types 15 thereon print against the front side of the platen (not shown). Whenever a numeral-key 11 or alphabet-key 10 is depressed, it feeds a carriage (not shown) along the distance of one letter-space.

Serial No. 599,751.

lVhen it is desired to bring the carriage rapidly to a more or less distant letter-space in its travel, the tabulating mechanism may be made effective by depressing a finger-piece or connecting key 25 which is pivoted by a shouldered screw 26 on a bracket-27, held by screws 28.to the frame of the typewriter inside of a side member 29 at the end of the keyboard. When the key 25 is depressed, a cam 30 on it rides down-upon a universal bar or bail 31 which'is mounted in arms 32, pivoted to shouldered screws 33 each fast in one of the sides'29.

As the cam 30 descends it rocks the bar 31 rearwardly, swinging the connecting hooks 34 'rearwardly, because it bears against the front sides of said hooks. Each hook 34 is pivoted by a shouldered screw 35 upon the front end of a decimal-key-lever 36 pivoted intermediate its ends at 37, and adapted to lift its one of an array of counterstops (not shown) intothe path of the usual column-stop (not shown), adjustably mounted on the carriage. To enable any hook 34 to carry down its key-lever 36 in the manner described, each hook is provided with jaws 1 42, which, at the depression of the connecting key 25, are adapted to extend over and embrace a. stud .43 on its numeral key-lever .12, so that the depression of the numeralkey'will carry downthe tabulating lever 36 to make its associated stop effective; the carriage being released and arrested in the usual well-known manner. p

Each numeral-key 11, above referred to, is preferably provided with'a special body 62 anda top 63, so that the top maybe rotated to display the numeral printed by the key, or the decimal place at which the key will arrest the carriage when operated in either of two systems of pointing off I numbers. For this purpose, the bodies 62 are made fast to the key-levers 12, in any suitable manner, and the rotatable tops 63 include body, leaving a segmental opening large annular rings 64 having lugs 65 which are adapted to be turned under the bodies. The

enough to display the character printed by,

the key (as shown in Figure 2), or to display either one of the tabulating device egends (as shown in Figure 5).

In order to detain the shield 67 in position to display any desired legend or designation,-

shield 67 to display any desired one of the three legends;

The numeral type-bars may include the usual upper and lower-case types and thekey-heads may bear corresponding upper and lower-case designai'ions.

It willbe seen by inspection of Figures 2 and 4 that each tabrlator key has three designations thereon,-one designation correspending with the type of the associated type-bar, and two decimal tabulator design ations. The designations of each key are spacedequi-distant fromeach other, and the shield or shutter 67 has a one-third-segmental cut-out of about 120 degrees, so as to expose only one of the designations at a time, the key-cap comprising the top 63, and the shutter 67 being engaged by the detent 69 to hold the shutter 67 in any one of its positions.

Variations may be resorted ltO within the scope of the invention, and portions ofuthe improvements may be used without others.

Having thus described my invention, I claim:

1. In combination, a typewriter-key having a fixed head bearing a plurality of difierent characters, a transparent disk, a shutter having an aperture to disclose one character and obscure the others, .a flanged shutterrotating key-cap rotatable about the headand formed of a single piece and having ears to retain the cap on, the head without interfering with the rotation thereof, and J ate disclosure of each character, and too large to protrude through the perforations.

2. In. combination, a key having three symbols printed on its face, a shield 'constructed to conceal two of said symbols and to reveal the third, the shield being rotatable on the key to select the symbols to be con-,

cealed, and consisting entirely of a shutter upon the face of the key, and a hollow cylindrical member, having an inturned upper flange secured to the shutter and inturned lower projections holding the shield rotatably on the key, the hollow cylindrical portionhaving spaced openings, and a detent to co-operate with any one of said openings to detain the shield in its difi'erent efiective rotated positions 3. In combination, a typewriter-key having a fixed head bearing a plurality of characters, a transparent disk, a shutter having an aperture to disclose one character and obscure the others, a flanged shutter-rotating key-cap rotatable about the head and formed with ears to retain the cap on the head, detent-holes through the side wall of the cap, and a spring-pressed spherical detent carried by the head to interlock with any hole in the cap.

CHARLES T. MILLER, Jr. 

